Add Item list interface, but acts_as_list can not used

app/controllers/admin/items_controller.rb

@@ -9,6 +9,18 @@ class Admin::ItemsController < ApplicationController
     @items.unshift Item.find_by_name("root") if @parent_item.name == 'root'
   end
  
+  def up
+    @item = Item.find(params[:id])
+    @item.move_higher
+    redirect_to admin_items_url( :parent_name => @item.parent_name )
+  end
+  
+  def down
+    @item = Item.find(params[:id])
+    @item.move_lower
+    redirect_to admin_items_url( :parent_name => @item.parent_name )
+  end
+  
   protected
   
   def find_snippets